CVE-2022-47941 Explained : Impact and Mitigation
Learn about CVE-2022-47941, a memory leak vulnerability in Linux kernel versions 5.15 through 5.19. Explore its impact, technical details, affected systems, and mitigation steps.
An issue was discovered in ksmbd in the Linux kernel 5.15 through 5.19 before 5.19.2. fs/ksmbd/smb2pdu.c omits a kfree call in certain smb2_handle_negotiate error conditions, aka a memory leak.
Understanding CVE-2022-47941
This CVE describes a memory leak vulnerability in the Linux kernel version 5.15 through 5.19 before 5.19.2.
What is CVE-2022-47941?
The vulnerability in the ksmbd component of the Linux kernel can lead to a memory leak due to a missing kfree call in specific error conditions during smb2_handle_negotiate.
The Impact of CVE-2022-47941
Exploitation of this vulnerability could result in resource exhaustion, leading to a denial of service condition or potential privilege escalation.
Technical Details of CVE-2022-47941
This section provides more insights into the vulnerability.
Vulnerability Description
The issue lies in fs/ksmbd/smb2pdu.c, specifically in the handling of smb2_handle_negotiate error conditions, where a crucial kfree call is omitted, causing a memory leak.
Affected Systems and Versions
The vulnerability affects Linux kernel versions 5.15 through 5.19, before the release of version 5.19.2.
Exploitation Mechanism
An attacker could exploit this vulnerability by triggering the specific error conditions related to smb2_handle_negotiate, leading to a memory leak.
Mitigation and Prevention
To address CVE-2022-47941, follow these security measures.
Immediate Steps to Take
- Update the affected Linux kernel to version 5.19.2 or newer to eliminate the memory leak vulnerability.
- Monitor system resources for any signs of abnormal memory consumption.
Long-Term Security Practices
- Regularly apply security patches and updates to the Linux kernel to mitigate potential vulnerabilities.
- Conduct regular security audits and scans to identify and address any security gaps.
Patching and Updates
Stay informed about security updates and patches released by the Linux kernel community. Ensure timely deployment of these updates to maintain system security.